@Kevin_Z It seems I finally found the software bug. It has nothing to do with the android app. It is in the router software. When I enable "Wireless Schedule", the 5G goes ON automatically and will...

@Ivaylo problem solved (so far) with hard reset (Method 1). Thank you !

Hello, I have this issue with Archer C80 AC1900 brand new router: when I disable (and save config) the 5G WIFI, after a few minutes , the 5G wifi network keeps enabling back. Is there any way I can...